Bump to 0.44.0.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cargo"
-version = "0.43.0"
+version = "0.44.0"
 edition = "2018"
 authors = ["Yehuda Katz <wycats@gmail.com>",
            "Carl Lerche <me@carllerche.com>",

src/cargo/core/compiler/build_context/target_info.rs

@@ -39,8 +39,6 @@ pub struct TargetInfo {
     pub rustflags: Vec<String>,
     /// Extra flags to pass to `rustdoc`, see `env_args`.
     pub rustdocflags: Vec<String>,
-    // Remove this when it hits stable (1.41).
-    pub supports_pathless_extern: Option<bool>,
 }
 
 /// Kind of each file generated by a Unit, part of `FileType`.
@@ -103,13 +101,6 @@ impl TargetInfo {
             .args(&rustflags)
             .env_remove("RUSTC_LOG");
 
-        let mut pathless_test = process.clone();
-        pathless_test.args(&["--extern", "proc_macro"]);
-        let supports_pathless_extern = match kind {
-            CompileKind::Host => Some(rustc.cached_output(&pathless_test).is_ok()),
-            _ => None,
-        };
-
         if let CompileKind::Target(target) = kind {
             process.arg("--target").arg(target.rustc_target());
         }
@@ -192,7 +183,6 @@ impl TargetInfo {
                 "RUSTDOCFLAGS",
             )?,
             cfg,
-            supports_pathless_extern,
         })
     }
 

src/cargo/core/compiler/mod.rs

@@ -1018,13 +1018,7 @@ pub fn extern_args<'a>(
             link_to(dep, dep.extern_crate_name, dep.noprelude)?;
         }
     }
-    if unit.target.proc_macro()
-        && cx
-            .bcx
-            .info(CompileKind::Host)
-            .supports_pathless_extern
-            .unwrap()
-    {
+    if unit.target.proc_macro() {
         // Automatically import `proc_macro`.
         result.push(OsString::from("--extern"));
         result.push(OsString::from("proc_macro"));

tests/testsuite/proc_macro.rs

@@ -443,10 +443,6 @@ Caused by:
 
 #[cargo_test]
 fn proc_macro_extern_prelude() {
-    if !is_nightly() {
-        // remove once pathless `--extern` hits stable (1.41)
-        return;
-    }
     // Check that proc_macro is in the extern prelude.
     let p = project()
         .file(

tests/testsuite/rustc_info_cache.rs

@@ -6,11 +6,6 @@ use std::env;
 
 #[cargo_test]
 fn rustc_info_cache() {
-    if !cargo_test_support::is_nightly() {
-        // remove once pathless `--extern` hits stable (1.41)
-        return;
-    }
-
     let p = project()
         .file("src/main.rs", r#"fn main() { println!("hello"); }"#)
         .build();